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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea74397e586261ce27368ee18f3c96f6156f628cbdaab62fc6f75f65480a139e' 
  AND token = '65i9GuK2NvXai4ltt0IdYpyDeYc8m3YkWEDq4Tctihk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}